Balance the following equations if the reactions will occur.

gold + oxygen
Au + O2 --> ???????

barium + oxygen
Ba + O2 --> ???

bismuth + oxygen -->
Bi + O2 --> ???

help please. keep in mind this is single replacement

2 answers

None of these are single replacement. All of them, if they react, are synthesis.
Ahh ok. I guess the worksheet tried to trick me. Thanks alot!